Pain produced by a malfunctioning nerve can be extremely severe.
Don't throw bad money into a company whose tailpipe is malfunctioning, causing a strange odor to fill the car.
For example, research has shown that most carbon-monoxide alarm incidents are triggered by a malfunctioning furnace.
malfunction mal·func·tion (māl-fŭngk'shən)
v. mal·func·tioned, mal·func·tion·ing, mal·func·tions
To fail to function.
To function improperly.
Failure to function.
Faulty or abnormal functioning.